Machining process of high-precision thin-walled pure aluminum or aluminum alloy pipes

Abstract

The invention provides a machining process of high-precision thin-walled pure aluminum or aluminum alloy pipes, and the machining process aims to solve the problems that in a traditional extrusion production process of high-precision aluminum or aluminum alloy pipes, the size precision and the yield are low, and in horizontal continuous casting, the wall thickness uniformity is poor and mold sticking is prone to happening. The method adopts a vertical continuous casting technology to prepare the high-precision thin-walled pure aluminum or aluminum alloy pipe blanks, the solid-liquid interfaceposition is located at the transition area of a heat section and a cold section by controlling the continuous casting and molding, the formed pipe blanks have columnar crystal structures with high inner and outer surface quality and high orientation degree in the continuous casting direction, axial extending deformation of subsequent cold machining like rolling and drawing is facilitated, the continuous cast pipe blanks can be directly subjected to large-deformation cold machining and molding without face milling, short-process production of the high-precision thin-walled pure aluminum or aluminum alloy pipes is achieved, and the problems that in a traditional process of the high-precision thin-walled pure aluminum or aluminum alloy pipes, the investment is large, the process is long, theyield is low and the cost is high are solved.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and relates to a high-precision thin-walled pure aluminum or aluminum alloy pipe processing technology. Background technique [0002] High-precision thin-walled aluminum tubes have the advantages of low density, corrosion resistance, and high specific strength, making them good structural materials for aerospace, weaponry, transportation, and other fields. Aluminum is the second largest metal material after steel. With the rapid development of modern aerospace, marine engineering, machinery manufacturing and other technologies, the requirements for aluminum pipes continue to increase and improve. High-precision thin-walled pipes have become the main One of the development trends. The main feature of high-precision aluminum tubes is high surface and dimensional accuracy requirements, for example: the inner surface of the tube is not allowed to have any slight scratches, scratches and othe...

AI Technical Summary

Problems solved by technology

[0006] The purpose of this invention is to solve the problems of large investment, long process, low yield and high cost of traditional high-precision thin-walled pure aluminum pipe technology

Utilizing the characteristics of uniform heat transfer in the vertical continuous casting direction, the wall thickness of the tube billet can be made uniform, and the problem of uneven wall thickness in the horizontal continuous casting and extrusion process can be solved; by adopting the outer mold with a special structure, the inner surface of the mold has been specially treated Coating treatment, so as to solve the problem of aluminum liquid sticking to the surface of the casting mold; by adopting an outer mold with a short cold section, combined with strong secondary cooling, the temperature gradient of continuous casting can be increased to solve the shrinkage rate when aluminum solidifies A high-precision thin-walled pure aluminum or aluminum alloy pipe processing technology for larger problems

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